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Barycentric Location Estimation for Wireless Network Indoors Localization
GuoDong Kang,Tanguy Perennou,Michel Diaz 보안공학연구지원센터 2009 International Journal of Hybrid Information Techno Vol.2 No.2
The localization requirements for mobile nodes in wireless (sensor) networks are increasing. However, most research works are based on range measurements between nodes which are often oversensitive to the measurement error. In this paper we propose a location estimation scheme based on moving nodes that opportunistically exchange known positions. The user couples a linear matrix inequality (LMI) method with a barycenter computation to estimate its position. Simulations have shown that the accuracy of the estimation increases when the number of known positions increases, the radio range decreases and the node speeds increase. The proposed method only depends on a maximum RSS threshold to take into account a known position, which makes it robust and easy to implement. To obtain an accuracy of 1 meter, a user may have to wait at the same position for 5 minutes, with 8 pedestrians moving within range on average.
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Meng Kang,Chenglong Li,Dehai Yu,Guodong Li,Zhaoping Song,Huili Wang,Wenxia Liu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7
Cellulose nanopaper has attracted tremendous attention as an alternative to fossil-based flexible substrates. However, the fabrication of nanopaper from cellulose nanofibers (CNFs) is a time-consuming process. Herein, positivelycharged CNFs (PCNFs) were employed to heterocoagulate negatively charged CNFs (NCNFs) at various PCNF-to-NCNFratios in order to decrease the formation time of nanopaper. At a PCNF-to-NCNF ratio of 1:1, the formation time was reducedfrom 98 min to 20 min. Although heterocoagulation increases the roughness of cellulose nanopaper, nanopapers made from amixture of NCNFs and PCNFs still possess a nanosized network structure and therefore show similar transparency tonanopapers made of pure NCNFs. Compared to the nanopaper made from pure NCNFs, the nanopaper made from themixture of NCNFs and PCNFs showed reduced tensile strength but improved resistance to deformation. This study providesa practical method for the production of cellulose nanopaper.
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Olayinka Oderinde,Imtiaz Hussain,Mengmeng Kang,Yuanfeng Wu,Kalulu Mulenga,Ismaeel Adebayo,Fang Yao,Guodong Fu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
In this study, we report the utilization of different water contents (0–40 vol.%) as cosolvent to ethaline,ChCl:EG (deep eutectic solvent) at the mole ratio of 1:2 to prepare binary oxide of tungsten oxide-molybdenum oxide nanocomposite in an ambient environment, followed by characterization using XRD,FTIR, SEM, TEM, TGA, XPS and UV–vis spectroscopy. The as-prepared composite composed of aggregatedparticles at low temperature of 60 C, in the crystallite sizes ranging from~48.40 to 71.97 nm, with watercosolvent acting as bad solvent. Further characterizations revealed that the atomic percentage ratios oftungsten and molybdenum components increase with decrease in carbon content as the water contentincreases, while the morphology changes from cubic to prismatic polyhedral-like structures at lowtemperature, in addition to retaining ~73% of its original weight above 700 C. The UV–vis analysisrevealed broad absorption at 239–374 nm with a threshold value of 527 nm and can attain maximumphotochromic response in less 60 s on exposure to UV–vis light irradiation.
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